I’m not too familiar with Analog four MKI but you may want to state which firmware you’re currently using, make sure it’s the current one, and then there are a couple threads with bug reports. I assume this one I linked is the most current.
I did a quick search in the thread (using the check box for “search this topic” in the magnifying glass drop down) for the keyword “LFO” but I didn’t see specifically what you’re talking about.
You might be able to refine the search criteria a little further and see if you come up with anything. There is also another older bug reports thread for the prior firmware in case that’s what you’re on. Worth taking a look at least, sounds annoying!